<html>
<head>
    <title>Index Page</title>
</head>
<body>
<h1>发布会管理</h1>
<form method="post" action="/login_action/">
    <input type="text" name="username" placeholder="username"><br>
    <input type="password" name="password" placeholder="password"><br>
    {{ error }}<br>
    <button id="btn" type="submit">登录</button>
    {% csrf_token %}
</form>
</body>
</html>